Baal HaSulam, “The Writings of Baal HaSulam Volume 1, “The Quality of the Wisdom of the Hidden in General,” This Superior Principle Is Defined in One, Unique, and Unified One: It is obvious that the upper one is one. He comprises the whole of reality and all the times—past, present, and future—for one cannot give that which one does not have. Had the whole of reality and the existence of reality not been included in Him they would not have emerged from Him, as is evident to any scrutinizer, and without minding that we find corruptions in the manners of the existence of reality.
Indeed, know that this is the study that the sages of the hidden call “one.” The first to study it was Abraham the Patriarch. (This is explained in the Book of Creation and is therefore attributed to Abraham the Patriarch.) This means that there aren’t two authorities here—good and bad—but only good.
The fundamental principle of the wisdom of Kabbalah is that there is only one force, one goal, one path, and one movement, in the universe, that is, only one source, besides which nothing exists. Hence the saying: “There is nothing else besides Him.”
All that seems to us to exist besides Him, is in fact, Him. The fact that someone somewhere and somehow sees that something supposedly exists is just a slight misalignment, a difference from the center, when you have to combine two lines so that they hit the target slot exactly. Then, the person will again begin to feel that there is none besides the Creator.
All deviations from the concept of “one, unique, and unified” are given to us so that we will repeatedly strive to confirm it and merge ourselves with it. This is the goal of our development. Development is to enter and dissolve in this unity.
It does not fit into our mind, memory, nor in our analytical capabilities because for this we need to completely redo our approach, our view of the goal, the world, space, time, motion, and in general, everything. We should relate everything to only one sensation: I exist or He alone.
Question: So, I do not exist? Is there only Him?
Answer: Of course, I do not exist. I exist only when I differ from Him or when I merge with Him.
From the Kabbalah Lesson in Russian 1/27/19